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Leases Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Leases [Abstract]        
Operating lease cost $ 3,344 $ 2,567 $ 6,941 $ 7,440
Amortization of right-of-use asset 33 41 66 67
Interest on lease liabilities 4 6 9 10
Total finance lease cost $ 37 $ 47 $ 75 $ 77